Do you have good Test Point Voltages? It appears there are silver colored Test points on the I/O Board. I am working on a water spill and trying to troubleshoot if both the I/O board and the Logic need replaced.

P5 pentalobe screwdrivers are too big! The correct size for these screws are p4 pentalobe. P5 pentalobe was just able, with difficulty, to turn some of the screws. If the screws were at all tight, my p5 was unable to get them out, and started to strip the screws. A p4 screwdriver fit better and removed the screws with ease. (I was using high quality Wiha brand screwdrivers.)

Very simple installation. The screwdriver heads were exactly what we’re needed, one head for the outside case screws, the other for the screws holding the battery in place. The computer started right up. Now to see how the battery holds up, but I have a good feeling about this!

Comments that the P5 pentalobe are too large are absolutely spot-on. There is no way the P5 pentalobe bit I have will work with the MacBook Air without destroying the screws. Hard target search for P4 pentalobe bit in progress…..

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There is a nub on the inside of the case which is attached to the battery. When you try to pull it open, it appears to be attached to the plastic casing of the battery, which sometimes splits. I gently unhooked the nub from the battery before removing the case fully. This seems to happen if the battery has suffered some drop damage (plastic parts broken around screws and parts of plastic frame split). Just an FYI in case your lower case doesn't pull away easily.

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The following connector has an especially deep socket. Use care when disconnecting it.

While gently pulling the I/O board cable upward near its connection to the logic board, use the flat end of a spudger to pry up on alternating sides of the connector to help "walk" it out of its socket.

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I did not find it necessary to loosed the retainer flap, unplug the ribbon cable from it's socket, or remove the fan. After removing the fan screws in Step 9, the fan was loose enough that it can be slightly moved to the side. I felt that loosening the retaining flap and removing the fan adds unnecessary potential to damage something. To the contrary, if you bump the fan while it's plugged in, you might damage the ribbon cable.

It is a lot easier to insert the flat ribbon in its socket before placing the fan back in place. BUT DO NOT YET FLIP BACK the retaining flap, until you have seated and screwed the fan. This way in case you pull on the fan by mistake, the flat ribbon is free to come out, otherwise you may tear it.

I did not find it necessary to remove the fan or unplug the ribbon cable from it's socket. After removing the fan screws, the fan was loose enough that it can be slightly moved to the side. I felt that loosening the retaining flap and removing the fan adds unnecessary potential to damage something. To the contrary, if you bump the fan while it's plugged in, you might damage the ribbon cable.

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When following these steps in the reverse order to reassemble the machine, I found it much easier to insert the ribbon cable before inserting the I/O board into it's place and installing the screw (Step 14). This adds potential for any sudden movement to damage the ribbon cable, so gentle care must be exercised.

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When following these steps in the reverse order to reassemble the machine, I found it much easier to insert the ribbon cable before inserting the I/O board into it's place and installing the screw (Step 14). This adds potential for any sudden movement to damage the ribbon cable, so gentle care must be exercised.

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Turn the computer onto its opposite edge so the right display screw is now easily accesible.

Before removing the last display screw, be sure to hold the display and upper case steady with your other hand. Failure to do so may allow the components to fall onto the table, causing potentially expensive damage.

Remove the last 4.9 mm T8 Torx screw securing the display to the upper case.

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Just a reminder that you DO NOT want to touch the battery with your hands or a screw driver you can compromise the integrity of the battery and possibly cause a thermal event. Always use proper battery cover kit.

When reassembling the device, keep in mind that the holes in the hinges are relatively big compared to the T8 screws, so there will be a certain play. Check if display and body are in line when the MacBook is closed, then tighten the screws.

Upon completing the installation of the new screen I found out that the screen backlight was not working. I checked all connections and everything was connected properly. I checked the fuse that has the “P” on it and it does not appear to be blown. I looked over other chips on the board and did not find anything else blown. Are there any other things I should look into before assuming that the display is the problem?